The Grammy-winning artist took to Instagram to let students at her former high school, Columbia High School in Maplewood, New Jersey, know she was paying for lunch on Tuesday at Sabatino's Pizza and, if interested, stop by and grab a slice.   Students swarmed the pizza spot for their free slice. The crowd got so big that cops had to come in and shut down the main road to the town.  Parents posted photos of the event on social media. Reactions were mixed, but sources there said things went smoothly.  Source: Playboy